Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Can we instantiate Interfaces?

Ericsson,

7 15798

What do you mean by the term transient?

Ericsson,

5 11625

What are the two ways you can synchronize a block of code?

Ericsson,

5 14287

Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?

Ericsson,

7 11477

How can you sort dates?

TCS,

2 9420

Why to give the file name same as the public class name in java?

3 7278

Is there any use of an abstract class which has no methods and no attributes?

Wipro,

1 4978

If your team member writes code with lots of static variables and static methods, will it cause any side effects?

KPIT,

3 7613

If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?

KPIT,

5 9060

I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?

KPIT,

3 6977

There is a Banking application. It has 2 types of account, Savings and Current. Write a method calculateInterest by passing an ArrayList of these account objects and calculate Interest accordingly. Write code for this situation

ABC, KPIT,

1 3616

If two threads call a static method at the same point of time, what will happen?

KPIT,

3 8958

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

KPIT,

9 14024

There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?

KPIT,

6 10959

I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?

KPIT,

8 11989

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Un-Answered Questions { Core Java }

What is the difference between synchronized and synchronized block?

1110

What are predefined functions?

1207

What is treeset and treemap in java?

1142

What is a prefix function.write down a code to compute prefix function.

1114

How to stop a thread in java? Explain about sleep () method in a thread?

1074

Explain the selection sort algorithm?

1120

What is class array in java?

1128

What is a singleton class in Java?

1151

Why arraylist is used in java?

1122

What is close method? How it's different from Finalize & Dispose?

1131

What is comparator in java?

1071

What is method overloading with type promotion?

1345

What does string intern() method do?

1135

What does += mean coding?

999

Can a java program have 2 main methods?

1105

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